Improvement in composition for purifying illuminating-gas



and PETER GAn'rwRiGH'r,

and State of New York, have inven-teda new and machinery generally WILLIAM H. ST. JOHN AND PETER IMPROVEMENT IN oaarwnren'r, or new YORK, N. Y.

COMPOSITION FOR PURI FYlNG ILLUMINATING-GAS.

Specification forming part of Letters Patent No. 76,544, dated April 7, 1868.

- To all whom it may concern:

Be it known that we, WILLIAM H. S1. J OHN of the city, county,

and Improved Mode or Process of Purifying Illuminating-Gas made from bituminous coal; and we do hereby declare that the following is a full, clear, and exact description thereof,

and the manner of using the same.

The nature of our invention consists in using the hydrated or hematite iron. ores in a fine or pulverized condition, addin g thereto, according to the richness or quality of the ores used, gray cast-iron borings, turning's, or filingssufi ficient to make the mass: equal to about eighty per cent. of pure metal: it is then to be thor'-- saturated with ammo'niacal liquor,

oughl y when it should be thrown into aheap and allowed to generate heat enough to produce evaporation, which makes itself evident by the escape of steam, after which it should be scattered into a layer, say twelve or fifteen inches deep, and stirred or worked till all moisture has disappeared. well as the horin gs is then complete. *0 then add five per cent. of puly'erized charcoal to the mass andmix it well tog'ether,- when the com- Before placing the.

position is ready for use. composition in the purifiers, we moisten it with water, as lime is in the purificationiby lime.

We then place a layer of perforated boards in the bottom of the purifier for the material to rest upon ,it is then thrown in from two to three feet deep, as the purifier may be, when it is leveled off, and the purifier is closed up to,

receive the gas. We use the same purifiers of purification'by lime. After the stren'gthof the composition i exhausted, (as ascertained by the usual test.);the purifierisehanged in The oxidation of the ore as used in the method We claim that our composition, prepared and ter and will last longer than any other, by maintaining its porosity without the aid of sawdust, 850., and its strength. not only to purifythe gas, but to throw off by evaporation "alarge percentage of the impurities neutralized by the fumes of ammonia precipitated into itself; that it most eftect'ually destroys the unhealthy and objectionable odor of sulphide of hydrogen existing in all districts where gashouses are located 5': also, that on account of reduced full fifty=per eent.

necessary 7 is and desire What weelaim as our invention, to secure by Letters Patent,"is-'- The process of purifying illuminating-gas made from bituminous coals, it through a. composition of pulverized iron ore strengthened to about eighty per cent. of

ized charcoal, and prepared as more fully set forth above.-- v

WM. H. ST. JOHN.-

. PETER GABTWBIGHT,

. Witnesses:

JOHN J. THOMASSON,

WILLIAM T."BALLAR D.

used as above set forth,.performs its-work hetthe fewer'changes of the purifiers thelabor treated in the same by transmitting pure metal, moistened withammoniaeal liquor w and mixed with about five per cent. of pulver 

